<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <link rel="icon" href="images/favicon.ico" type="image/x-icon">
        <title>HTML5技术</title>
        <link rel="stylesheet" href="index.css" type="text/css">
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    <body>
        <header>
            <span id="title">HTML5技术</span>
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        <nav id="nav-top">
            <ul>
                <li><a href="index.html">首页</a></li>|
                <li><a href="html5.html">HTML5</a></li>|
                <li><a href="css.html" class="active">CSS</a></li>|
                <li><a href="javascript.html" >JAVASCRIPT</a></li>
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            <div id="side-bar">
                <ul>
                    <li>CSS</li>
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